octeontx2-af: Simplify a size computation in rvu_npc_exact_init()

We know that table_size = table->mem_table.depth * table->mem_table.ways,
so use it instead, it is less verbose.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/5230dabe27f48948a9fd0f50a62e2437b65e6a6e.1669378798.git.christophe.jaillet@wanadoo.fr


Signed-off-by: Jakub Kicinski <kuba@kernel.org>